feat: 添加 --advice 参数，支持快速获取执行建议

- 新增 scripts/core/advice_generator.py 建议生成器模块
- 在 config.py 中添加 DEPENDENCIES 依赖配置
- 在 lyxy_document_reader.py 中添加 -a/--advice 参数
- 复用 Reader 实例的 supports 方法检测文件类型
- 支持平台检测，对 macOS x86_64 PDF 返回特殊命令
- 添加单元测试和集成测试
- 更新 SKILL.md，引导优先使用 --advice 参数
- 更新 README.md，添加项目结构说明
- 添加 openspec/specs/cli-advice/spec.md 规范文档

tests/test_cli/test_main.py

@@ -4,6 +4,41 @@ import pytest
 import os
 
 
+class TestCLIAdviceOption:
+    """测试 CLI --advice 参数功能。"""
+
+    def test_advice_option_pdf(self, cli_runner):
+        """测试 -a/--advice 选项对 PDF 文件。"""
+        stdout, stderr, exit_code = cli_runner(["test.pdf", "-a"])
+
+        assert exit_code == 0
+        assert "文件类型: PDF" in stdout
+        assert "[uv 命令]" in stdout
+        assert "[python 命令]" in stdout
+
+    def test_advice_option_docx(self, cli_runner):
+        """测试 --advice 选项对 DOCX 文件。"""
+        stdout, stderr, exit_code = cli_runner(["test.docx", "--advice"])
+
+        assert exit_code == 0
+        assert "文件类型: DOCX" in stdout
+
+    def test_advice_option_url(self, cli_runner):
+        """测试 --advice 选项对 URL。"""
+        stdout, stderr, exit_code = cli_runner(["https://example.com", "--advice"])
+
+        assert exit_code == 0
+        assert "文件类型: HTML" in stdout
+
+    def test_advice_option_unknown(self, cli_runner):
+        """测试 --advice 选项对未知文件类型。"""
+        stdout, stderr, exit_code = cli_runner(["test.xyz", "--advice"])
+
+        assert exit_code != 0
+        output = stdout + stderr
+        assert "无法识别" in output or "错误" in output
+
+
 class TestCLIDefaultOutput:
     """测试 CLI 默认输出功能。"""
 

tests/test_core/test_advice_generator.py

@@ -0,0 +1,195 @@
+"""测试 advice_generator 模块。"""
+
+import pytest
+from unittest.mock import patch
+
+from core.advice_generator import (
+    detect_file_type_light,
+    get_platform,
+    get_dependencies,
+    generate_uv_command,
+    generate_python_command,
+    format_advice,
+    generate_advice,
+)
+from readers import READERS, PdfReader, DocxReader, HtmlReader
+
+
+@pytest.fixture
+def readers():
+    """提供已实例化的 readers 列表。"""
+    return [ReaderCls() for ReaderCls in READERS]
+
+
+class TestDetectFileTypeLight:
+    """测试轻量文件类型检测函数。"""
+
+    def test_detect_pdf(self, readers):
+        """测试检测 PDF 文件。"""
+        reader_cls = detect_file_type_light("test.pdf", readers)
+        assert reader_cls == PdfReader
+
+    def test_detect_docx(self, readers):
+        """测试检测 DOCX 文件。"""
+        reader_cls = detect_file_type_light("test.docx", readers)
+        assert reader_cls == DocxReader
+
+    def test_detect_html(self, readers):
+        """测试检测 HTML 文件。"""
+        reader_cls = detect_file_type_light("test.html", readers)
+        assert reader_cls == HtmlReader
+
+    def test_detect_url(self, readers):
+        """测试检测 URL。"""
+        reader_cls = detect_file_type_light("https://example.com", readers)
+        assert reader_cls == HtmlReader
+
+    def test_detect_unknown(self, readers):
+        """测试检测未知文件类型。"""
+        reader_cls = detect_file_type_light("test.xyz", readers)
+        assert reader_cls is None
+
+
+class TestGetPlatform:
+    """测试平台检测函数。"""
+
+    def test_get_platform_format(self):
+        """测试平台标识格式正确。"""
+        platform_id = get_platform()
+        # 格式应该是 {system}-{machine}
+        assert "-" in platform_id
+        # 至少包含两个部分
+        assert len(platform_id.split("-")) >= 2
+
+
+class TestGetDependencies:
+    """测试依赖获取函数。"""
+
+    def test_get_default_dependencies(self):
+        """测试获取默认依赖配置。"""
+        python_ver, deps = get_dependencies(DocxReader, "Unknown-Platform")
+        assert python_ver is None
+        assert len(deps) > 0
+        assert "docling" in deps
+
+    def test_get_pdf_dependencies(self):
+        """测试获取 PDF 依赖。"""
+        python_ver, deps = get_dependencies(PdfReader, "Darwin-arm64")
+        assert python_ver is None
+        assert "docling" in deps
+
+    def test_get_html_dependencies(self):
+        """测试获取 HTML 依赖。"""
+        python_ver, deps = get_dependencies(HtmlReader, "Linux-x86_64")
+        assert python_ver is None
+        assert "trafilatura" in deps
+
+
+class TestGenerateUvCommand:
+    """测试 uv 命令生成函数。"""
+
+    def test_generate_simple_command(self):
+        """测试生成简单的 uv 命令。"""
+        cmd = generate_uv_command(
+            ["pkg1", "pkg2"],
+            "input.pdf",
+            script_path="scripts/lyxy_document_reader.py"
+        )
+        assert "uv run" in cmd
+        assert "--with pkg1" in cmd
+        assert "--with pkg2" in cmd
+        assert "input.pdf" in cmd
+
+    def test_generate_with_python_version(self):
+        """测试生成带 python 版本的 uv 命令。"""
+        cmd = generate_uv_command(
+            ["pkg1"],
+            "input.pdf",
+            python_version="3.12",
+            script_path="scripts/lyxy_document_reader.py"
+        )
+        assert "--python 3.12" in cmd
+
+    def test_generate_with_quoted_deps(self):
+        """测试生成带引号的依赖（如 unstructured[pdf]）。"""
+        cmd = generate_uv_command(
+            ["unstructured[pdf]", "pkg2"],
+            "input.pdf",
+            script_path="scripts/lyxy_document_reader.py"
+        )
+        assert '--with "unstructured[pdf]"' in cmd
+
+
+class TestGeneratePythonCommand:
+    """测试 python 命令生成函数。"""
+
+    def test_generate_python_command(self):
+        """测试生成 python 命令。"""
+        python_cmd, pip_cmd = generate_python_command(
+            ["pkg1", "pkg2"],
+            "input.pdf",
+            script_path="scripts/lyxy_document_reader.py"
+        )
+        assert python_cmd == "python scripts/lyxy_document_reader.py input.pdf"
+        assert pip_cmd == "pip install pkg1 pkg2"
+
+
+class TestFormatAdvice:
+    """测试建议格式化输出函数。"""
+
+    def test_format_without_platform(self):
+        """测试无平台特殊配置的格式化输出。"""
+        output = format_advice(
+            "pdf",
+            "test.pdf",
+            "Darwin-arm64",
+            "uv run --with docling ...",
+            "python scripts/lyxy_document_reader.py test.pdf",
+            "pip install docling ...",
+            has_platform_specific=False
+        )
+        assert "文件类型: PDF" in output
+        assert "输入路径: test.pdf" in output
+        assert "平台:" not in output
+        assert "[uv 命令]" in output
+        assert "[python 命令]" in output
+
+    def test_format_with_platform(self):
+        """测试有平台特殊配置的格式化输出。"""
+        output = format_advice(
+            "pdf",
+            "test.pdf",
+            "Darwin-x86_64",
+            "uv run --python 3.12 ...",
+            "python ...",
+            "pip install ...",
+            has_platform_specific=True
+        )
+        assert "平台: Darwin-x86_64" in output
+
+
+class TestGenerateAdvice:
+    """测试完整建议生成函数。"""
+
+    def test_generate_advice_pdf(self, readers):
+        """测试生成 PDF 的建议。"""
+        advice = generate_advice("test.pdf", readers, "scripts/lyxy_document_reader.py")
+        assert advice is not None
+        assert "文件类型: PDF" in advice
+        assert "[uv 命令]" in advice
+        assert "[python 命令]" in advice
+
+    def test_generate_advice_url(self, readers):
+        """测试生成 URL 的建议。"""
+        advice = generate_advice(
+            "https://example.com",
+            readers,
+            "scripts/lyxy_document_reader.py"
+        )
+        assert advice is not None
+        assert "文件类型: HTML" in advice
+
+    def test_generate_advice_unknown(self, readers):
+        """测试生成未知类型的建议。"""
+        advice = generate_advice("test.xyz", readers, "scripts/lyxy_document_reader.py")
+        assert advice is None